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In this tutorial, the presenter demonstrates diagnosing an oil seal leak in a two-stroke engine. By applying pressure, the crank's movement stabilizes around 7.5 to 8 psi, indicating that pressure is fine. Upon spinning the crank, the pressure fluctuates slightly but stabilizes again. Next, the presenter pulls a vacuum, noting the seal deteriorates as they reach about 15 inches of mercury. The importance of rotating the crankshaft during this process is emphasized, as it affects the oil seal's condition. The demonstration illustrates the relationship between pressure, vacuum, and the engine's components.